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Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Student Loan - Consumer Portfolio Segment - Troubled Debt Restructured Loans - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 76,393 | $ 69,212
TDR loans in forbearance | 84,991 | 69,796
TDR loans in repayment and percentage of each status: |  |
Loans current | 1,114,734 | 994,411
Total TDR loans in repayment | $ 1,249,805 | $ 1,118,848
Loans current | 89.20% | 88.90%
Total TDR loans in repayment | 100.00% | 100.00%
Total TDR loans, gross | $ 1,411,189 | $ 1,257,856
Loans delinquent 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 60,656 | $ 63,074
Loans delinquent | 4.90% | 5.60%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 46,771 | $ 36,804
Loans delinquent | 3.70% | 3.30%
Loans delinquent, greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 27,644 | $ 24,559
Loans delinquent | 2.20% | 2.20%

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